ALPHA-MICRO AMG

AMG-LL75x
High Efficiency Step Down LED Driver for High Brightness LED and OLED
1. Functional Description of the AMG-LL75x
The AMG-LL75x is a family of point-of-load regulator for LED lighting applications. By
providing a highly efficient constant current regulation off a DC source the AMG-LL75x is
perfectly suited for applications that require low DC levels for safety reasons, driving multiple
LED groups in one luminaire, mobile or in-vehicle lighting, and to refit existing low voltage
halogen installations.
2. Features














Input voltage 7 – 30V
Constant current output 200mA or 350mA
Low current ripple version of OLED (<1% Ipp)
Maximum output power 10W
Standard variants for 200mA and 350mA
Custom versions up to 500mA output
Capable of driving 1...5 white LEDs
Input transients up to 40V <0.5s
Up to 96% efficiency
PWM control input for dimming
Standby current max. 3.5mA
Optimized for point-of-load regulation
Connection options: Crimp, plug, solder
Surface mounting possible
3. Application
The AMG-LL75x is suitable for driving multiple LED groups in one luminaire, mobile or invehicle lighting, and to refit existing low voltage halogen installations.
3.1. Example Application Drawing
DC
Supply
LL75x
Figure 1: Typical Application.
AMG-LL75x
Revision: A
28. Mar. 2012
© All rights reserved
Page 1 of 12
AMG-LL75x
High Efficiency Step Down LED Driver for High Brightness LED and OLED
Table of Contents
1.Functional Description of the AMG-LL75x.............................................................................. 1
2.Features................................................................................................................................. 1
3.Application............................................................................................................................. 1
3.1.Example Application Drawing................................................................................................... 1
4.Picture.................................................................................................................................... 3
5.Pinning / Pad Coordinates..................................................................................................... 3
6.Absolute Maximum Ratings................................................................................................... 4
7.Electrical Characteristics........................................................................................................ 4
7.1.Operational Range................................................................................................................... 4
8.Application............................................................................................................................. 5
8.1.Thermal Precautions................................................................................................................ 5
8.2.Failure Modes........................................................................................................................... 5
8.3.Recommended Safety Measures............................................................................................. 5
8.4.Application Notes..................................................................................................................... 6
9.Ordering Information ........................................................................................................... 11
10.Module Dimensions............................................................................................................ 11
11.Board-Revision................................................................................................................... 11
12.Notes and Cautions............................................................................................................ 11
12.1.ESD Protection..................................................................................................................... 11
12.2.Storage conditions................................................................................................................ 12
13.Disclaimer.......................................................................................................................... 12
14.Contact Information............................................................................................................ 12
AMG-LL75x
Revision: A
28. Mar. 2012
© All rights reserved
Page 2 of 12
AMG-LL75x
High Efficiency Step Down LED Driver for High Brightness LED and OLED
4. Picture
Figure 2: Example Picture
5. Pinning / Pad Coordinates
Symbol
Description
Vin
Supply voltage positive input. Apply a DC voltage of 7V to 30V here.
The input is protected with a fuse and a diode to prevent damage from
reserved power supply and safely disconnect the power in case of
failure.
GND
Supply voltage negative input and ground reference for MOD input.
LEDa
Positive output for LED, connect the anode of the first LED of the
string to this pin.
LEDk
Negative output for LED, connect the cathode of the last LED of the
string to this pin. This pin is not identical to GND!
MOD
PWM input. Pulling this pin high shuts off the output. Feeding a PWM
signal with up to 1kHz can be used to control the brightness of the
connected LEDs. Pulling the pin high permanently puts LW05 in a
standby mode. This can be left unconnected if no brightness control is
required.
AMG-LL75x
Revision: A
28. Mar. 2012
© All rights reserved
Page 3 of 12
AMG-LL75x
High Efficiency Step Down LED Driver for High Brightness LED and OLED
6. Absolute Maximum Ratings
The Absolute Maximum Ratings may not be exceeded under any circumstances.
#
Parameter
Min
Max
Unit
1
Input Voltage (Vin relative to GND)*
-40
+30
V
2
MOD pin input voltage (relative to GND)
-0.3
Vin
-
3
Input Current: 1A
-
-
-
Operating Temperature:
4
LW05-200**
-30
+85
°C
5
LW05-350**
-30
+85
°C
Note(s):
1. * - (40V for 0.5 sec)
2. ** - in still air
7. Electrical Characteristics
7.1. Operational Range
#
Symbol
Parameter
Min
Max
Unit
1
Vin
Input Voltage
7
30
V
2
Istandby
Standby current (MOD = high)
3,5
mA
Note(s):
AMG-LL75x
Revision: A
28. Mar. 2012
© All rights reserved
Page 4 of 12
AMG-LL75x
High Efficiency Step Down LED Driver for High Brightness LED and OLED
8. Application
8.1. Thermal Precautions
When operating at elevated ambient temperature, vertical mounting in an air volume
sufficiently large enough to allow convection is recommended to reduce surface temperature
of the regulator. Additional cooling measures can help to further reduce the regulator
temperature and increase long term reliability. No part of the module surface may exceed
125°C during the operation at any time.
8.2. Failure Modes
The most common failure mode occur when the regulator is destroyed due to over
temperature, overvoltage, or an internal short circuit that causes the fuse to disconnect. The
fuse has the ability to disconnect failure currents up to 50A and will start to trip at 1A.
8.3. Recommended Safety Measures
Materials with low flash points must be kept away from the regulator. The surface temperature
of parts on the regulator may reach up to 125°C surface temperature when used at elevated
ambient temperatures and maximum power.
AMG-LL75x
Revision: A
28. Mar. 2012
© All rights reserved
Page 5 of 12
AMG-LL75x
High Efficiency Step Down LED Driver for High Brightness LED and OLED
8.4. Application Notes
a) Connecting the LEDs
The maximum of LEDs that can be driven by the AMG-LL75x depends on the supply
voltage and the combined forward voltage of the LEDs. Input voltage needs to be
approximately 2.5V higher than the total forward voltage of the LED string for the proper
operation.
b) Reducing Output Ripple
To reduce output ripple and possibly reducing EMC problems a capacitor maybe put
parallel to the LEDs, preferably connected direct between LEDa and LEDk of the AMGLL75x. The 200mA low ripple version comes equipped with a capacitor installed on the
module to optimize it for use with OLED.
c) EMC
The AMG-LL75x has been designed to produce a minimal level of EM emissions. As a
component this product cannot be EMC approved.
d) Brightness Control
The MOD input allows PWM dimming of the LEDs. By applying a voltage >1V≤Vin the
current to the LEDs is shut off. Frequencies up to about 1kHz can be applied to the MOD
input, though for good regulator stability it is recommended not to exceed 500Hz.
Dimming ranges of about 1% to 100% are possible.
e) Regulator Efficiency
The regulator efficiency depends on a number of parameters. Since there are a couple
constant losses independent of the total power delivered by the regulator the basic rule is
that the regulator is more efficient when used at high power (e.g. more LEDs connected).
A lower difference between input and output voltage does also increase efficiency.
AMG-LL75x
Revision: A
28. Mar. 2012
© All rights reserved
Page 6 of 12
AMG-LL75x
High Efficiency Step Down LED Driver for High Brightness LED and OLED
AMG-LL75x
Revision: A
28. Mar. 2012
© All rights reserved
Page 7 of 12
AMG-LL75x
High Efficiency Step Down LED Driver for High Brightness LED and OLED
AMG-LL75x
Revision: A
28. Mar. 2012
© All rights reserved
Page 8 of 12
AMG-LL75x
High Efficiency Step Down LED Driver for High Brightness LED and OLED
f) Output current
The output current varies somewhat depending on the forward voltage of LEDs and the
input voltage. If a more precise output current is required it can be set by using the MOD
input.
AMG-LL75x
Revision: A
28. Mar. 2012
© All rights reserved
Page 9 of 12
AMG-LL75x
High Efficiency Step Down LED Driver for High Brightness LED and OLED
g) Reliability
The reliability data is based on the data provided by component manufacturers:
Failure Rate (FIT): 1337 * 10ֿ9hֿ1
Mean Time to Failure (MTTF): 747943h
h) Identifying Current Values
The AMG-LL75x modules are marked with a color dot to identify the current value of the
module. The color dot also serves to identify that the module has been tested and is in
good standing. The color dot can be located on the input filter (the black square part next
to the input connector) of the module. Color coding can be located in the “Ordering
Information” table.
AMG-LL75x
Revision: A
28. Mar. 2012
© All rights reserved
Page 10 of 12
AMG-LL75x
High Efficiency Step Down LED Driver for High Brightness LED and OLED
9. Ordering Information
Order Code
Color Code
Description
AMG-LL751-IPM05E
Orange
350mA regulator, input solder, output solder
AMG-LL752-IPM05E
Orange
350mA regulator, input crimp, output solder
AMG-LL753-IPM05E
Orange
350mA regulator, input crimp, output plug
AMG-LL754-IPM05E
Orange
350mA regulator, input crimp, output crimp
AMG-LL755-IPM05E
Red
200mA regulator, low ripple, input solder, output solder
AMG-LL756-IPM05E
Red
200mA regulator, low ripple, input crimp, output crimp
Note(s):
10. Module Dimensions
Dimensions in mm
Height at thickest point: 6.5mm
Tolerances: Outer Contour: ±0.2mm
When mounting on a conductive surface make sure to add spacers or an insulating layer
under the module to avoid short circuits.
a) Crimp Connectors
The crimp connectors used on the LW05 require a special crimping tool. Crimping tools
can be purchased separately. Wires with insulation diameter 0.7 to 1mm fit into the
connectors.
11. Board-Revision
4 digit board revision code
12. Notes and Cautions
12.1. ESD Protection
The Requirements for Handling Electrostatic Discharge Sensitive Devices are described in the
JEDEC standard JESD625-A. Please note the following recommendations:
AMG-LL75x
Revision: A
28. Mar. 2012
© All rights reserved
Page 11 of 12
AMG-LL75x
High Efficiency Step Down LED Driver for High Brightness LED and OLED
 When handling the device, operators must be grounded by wearing a for the purpose
designed grounded wrist strap with at least 1MΩ resistance and direct skin contact.
 Operators must at all times wear ESD protective shoes or the area should be
surrounded by for ESD protection intended floor mats.
 Opening of the protective ESD package that the device is delivered in must only occur at
a properly equipped ESD workbench. The tape with which the package is held together
must be cut with a sharp cutting tool, never pulled or ripped off.
 Any unnecessary contact with the device or any unprotected conductive points should be
avoided.
 Work only with qualified and grounded tools, measuring equipment, casing and
workbenches.
 Outside properly protected ESD-areas the device or any electronic assembly that it may
be part of should always be transported in EGB/ESD shielded packaging.
12.2. Storage conditions
The AMG-LL75x corresponds to moisture sensitivity classification ML2, according to JEDEC
standard J-STD-020, and should be handled and stored according to J-STD-033.
13. Disclaimer
Information given in this data sheet is believed to be accurate and reliable. However, no
responsibility is assumed for the consequences of its use nor for any infringement of patents
or other rights of third parties that may result from its use.
The values stated in Absolute Maximum Ratings may under no circumstances be exceeded.
No warranty is given for use in life support systems or medical equipment without the specific
written consent of alpha microelectronics gmbh. For questions regarding the application
please contact the publisher.
The declared data are only a description of the product. They are not guaranteed properties
as defined by law. Examples are given without obligations and cannot give rise to any liability.
Reprinting of this data sheet – or any part of it – is not allowed without the license of the
publisher. Data sheets are subject to change without any notice.
14. Contact Information
This data sheet is published by alpha microelectronics gmbh. To order samples or inquire
information please contact:
alpha microelectronics gmbh
Im Technologiepark 1
15236 Frankfurt (Oder)
Germany
am.info@alpha-microelectronics.de
www.alpha-microelectronics.de
+49-335-557-1750 (telephone)
+49-335-557-1759 (fax)
© All rights reserved.
AMG-LL75x
Revision: A
28. Mar. 2012
© All rights reserved
Page 12 of 12